John w



(No Model.)

J. W. FRASER & J. 1). WILSON.

- VACUUM PUMP.

No. 496,559. Patented May 2, 1893.

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' Nrrn PATENT FFICE.

JOHN W. FRASER AND JOHN D. WILSON, OF LONDON, CANADA.

VACUUM-PUMP.

SPECIFICATION forming part of Letters Patent No. 496,559, dated May 2, 1893.

Application filed June 27, 1892. Serial No. 438,241. (No model.) Patented in Canada June 22, 1892, No. 39,177.

ence being had to the accompanying drawings, which form a part of this specification.

Our invention relates to improvements in pumps which employ an elastic tubing and suitable means for compressing the same whereby a vacuum is formed in the tubing which is quickly filled by the fluid which is.

being raised by the pump, and our invention consists of certain features of novelty which will be hereinafter fully described and specifically pointed out in the claims.

In the accompanying drawings: Figure l is a side view of our improved pump, and Fig. 2 is an end view thereof, the supporting bracket and elastic tube being shown in section.

Referring to the drawings:-A represents the base portion of the curved supporting bracket A, B the elastic tube supported on said curved bracket, and D flanges or guides formed integralwith thebracket to prevent the accidental displacement of the elastic tube. The base portion of the bracket is provided with flanges c which guide the standards E, when the latter are being adjusted.

The standards E are adjusted vertically by means of slots e formed in their lower ends and the pin F which also secures them to the base portion A. In the upper ends of said standards sockets d are formed for the reception of the trunnions of the piston G which consistsof the hub G and the radially extending arms I. The latter are forked at their outer ends and have mounted therein the rollers J, which bear upon the elastic tubing B. Rotary motion is imparted to the piston G by means of the crank-handle H, which is keyed to the trunnions of the said piston.

In order to obtain the best results from this device the radial arms of the piston should be so'arranged that one of the rollers in the arms will be in engagement with the elastic tube While the preceding one is being disengaged. 4

R. represents a screw clamp secured to the base A for attaching the pump to a support in any position as the circumstances may require.

The operation of our pumpis as follows:- One end of the tube is placed in the liquid to be raised, and the piston rotated by the crank H, so that the rollers will move along the tube from said end. During the rotation of the piston the rubber tube is compressed by the rollers as shown in Fig. 2, and as they move along the tube a vacuum is formed behind them into which the fluidis'forced by the pressure of the atmosphere, and is ejected from the other end. It will readily be seen that the pressure upon the tube can be regulated by the raising or lowering of the standard, and when the pump is not in use the piston can be raised from the said tube and thus relieve the pressure and thereby retain its elasticity and wearing qualities.

This invention has been described in' connection with liquids or fluids, but air or gases could be acted on in the same manner.

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is-

1. In a pump, the combination of the base, the curved supporting bracket formed integral with the base and having the flanges or guides 0 formed 011 it, the pair of standards provided at their lower ends with slots, and at their upper ends with eyes and adj ustably secured between the guides c, on opposite sides of the bracket, by a pin passing through the base and said slots, and the piston carrier secured between the upper ends of the standards by means of the axis passing through said parts, substantially as shown and described.

2. A pump consisting of a suitable base, a curved bracket supported on the base and having guides c, the pair of vertical standards adjustably secured between the guides c, on opposite sides of the curved bracket by means of slot and pin connection, and the rotary piston having a fixed bearing in the upper ends of said standards, substantially as and for the purpose set forth.

In testimony whereof We affix our signatures in the presence of the two undersigned witnesses.

JOHN V. FRASER. JOHN D. XVILSON.

\Vitnesses:

P. J. EDMUNDs, J AS. EDMUNDS. 

